Monitoring device



FIG. 1 is a perspective view of a first embodiment of an ornamental design for a monitoring device;

FIG. 2 is a front view of the first embodiment thereof;

FIG. 3 is a rear view of the first embodiment thereof;

FIG. 4 is a first side view of the first embodiment thereof;

FIG. 5 is a second side view of the first embodiment thereof;

FIG. 6 is a top view of the first embodiment thereof; and,

FIG. 7 is a bottom view of the first embodiment thereof.

FIG. 8 is a perspective view of a second embodiment of an ornamental design for a monitoring device.

The broken line in FIGS. 1-8 showing environmental structures is for illustrative purposes and forms no part of the claim design. 

The ornamental design for a monitoring device, as shown. 